[{"transactions":[{_id:1,created:"2022-12-21",firstname:"John",lastname:"Lenon"},{_id:2,created:"2022-12-31",firstname:"Jack",lastname:"Nicklson"},{_id:3,created:"2022-11-08",firstname:"Jenny",lastname:"Johnes"}]},{"key":2}]

db.collection.find({"transactions.created":"2022-12-21"},{transactions:{$elemMatch:{created:"2022-12-21"}}})